How to implement SQLDependency caching in Asp.Net?

See David Hayden's article on the subject for an example.

Generally you connect the dependency to a command and add the dependency when inserting into the cache.

var command = new SqlCommand("SELECT something FROM dbo.ATable", connection);
var dependency = new SqlCacheDependency(command);
var result = ObtainResultUsingThe(command);

Cache.Insert("CacheKey", result, dependency);

Observe that special rules apply for your queries. Among others:

• Named columns must be selected (no SELECT *)
• Must use fully qualified name of table (e.g. dbo.ATable)

Edit:

For using the dependency in caching an entire page, you can follow this example.